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# frozen_string_literal: true |
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2
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3
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require_relative '../../mixin/reflection' |
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4
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require_relative '../../path/segment' |
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5
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6
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module AMA |
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7
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module Entity |
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8
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class Mapper |
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9
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module Handler |
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10
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module Entity |
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11
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# Default attribute enumerator |
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class Enumerator |
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13
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include Mixin::Reflection |
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14
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15
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INSTANCE = new |
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16
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17
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# @param [Object] entity |
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18
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# @param [AMA::Entity::Mapper::Type] type |
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19
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# @param [AMA::Entity::Mapper::Context] _context |
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20
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def enumerate(entity, type, _context) |
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21
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::Enumerator.new do |yielder| |
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22
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type.attributes.values.each do |attribute| |
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23
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next if attribute.virtual |
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value = attribute.default |
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25
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if object_variable_exists(entity, attribute.name) |
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value = object_variable(entity, attribute.name) |
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end |
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segment = Path::Segment.attribute(attribute.name) |
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yielder << [attribute, value, segment] |
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end |
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31
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end |
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end |
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33
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34
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class << self |
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35
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include Mixin::Reflection |
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36
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37
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# @param [Enumerator] implementation |
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# @return [Enumerator] |
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def wrap(implementation) |
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40
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handler = handler_factory(implementation, INSTANCE) |
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description = "Safety wrapper for #{implementation}" |
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42
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wrapper = method_object(:enumerate, to_s: description, &handler) |
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wrapper.singleton_class.instance_eval do |
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include Mixin::Errors |
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end |
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46
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wrapper |
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end |
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48
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49
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private |
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50
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51
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# @param [Enumerator] implementation |
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52
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# @param [Enumerator] fallback |
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53
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# @return [Enumerator] |
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54
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def handler_factory(implementation, fallback) |
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lambda do |entity, type, ctx| |
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begin |
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57
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implementation.enumerate(entity, type, ctx) do |e, t, c| |
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58
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fallback.enumerate(e, t, c) |
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end |
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60
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rescue StandardError => e |
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61
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raise_if_internal(e) |
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62
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message = 'Unexpected error from enumerator ' \ |
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63
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"#{implementation}" |
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64
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signature = '(entity, type, context)' |
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65
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options = { parent: e, context: ctx, signature: signature } |
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66
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compliance_error(message, **options) |
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end |
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68
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end |
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69
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end |
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70
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end |
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71
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end |
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end |
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end |
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74
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end |
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end |
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end |
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ama-team /
ruby-entity-mapper
